Unified constant-frequency integration control of active power filters-steady-state and dynamics

Smedley, K.M.; Zhou, Liang; Qiao, Chongming

doi:10.1109/63.923776

Cited by 151 publications

(78 citation statements)

References 18 publications

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“…3). Similar to the two-level case present in [28], the key control equation of the existing one-cycle controller is given in…”

Section: B Model Of Current Loop Of Existing Occ Schemementioning

confidence: 99%

A Load Compensator Based on One-Cycle Control with Plug-In Repetitive Control

Hu¹,

Sun²,

Ma³

et al. 2015

Journal of Power Electronics

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This study proposes a novel one-cycle control scheme with a plug-in repetitive controller for load compensator. The novelty of this scheme lies in the combination of high dynamics and the simplicity of a one-cycle controller and good steady-state harmonic suppression ability of the repetitive controller. In addition, the proposed scheme can reduce the effect of the harmonics in phase voltage for the existence of the repetitive controller. Finally, experimental results on a three-phase, four-wire, three-level load compensator are reported to validate the effectiveness of the proposed control scheme.

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“…3). Similar to the two-level case present in [28], the key control equation of the existing one-cycle controller is given in…”

Section: B Model Of Current Loop Of Existing Occ Schemementioning

confidence: 99%

A Load Compensator Based on One-Cycle Control with Plug-In Repetitive Control

Hu¹,

Sun²,

Ma³

et al. 2015

Journal of Power Electronics

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“…Hence, according to the control equation in [17][18] [20], the value of k can be determined as 0.5. Let k=0.5, then equation (9) becomes:…”

Section: The Mocc Schemementioning

confidence: 99%

“…The OCC control block generates drive pulses for the switches. In order to demonstrate the MOCC, an existing control strategy is briefly represented, which was described in [17]. The control goal of the OCC is to guarantee the loads with an APF as a linear resistive load from the viewpoint of the ac supply side, which meets the following relationship: 2 , , ,…”

Section: Introductionmentioning

confidence: 99%

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An Improved One Cycle Control for Active Power Filters under Non-Ideal Voltage Conditions

Wang¹,

Ren²,

Yu³

et al. 2016

Journal of Power Electronics

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The one cycle control (OCC) scheme for active power filters (APFs) has shown excellent harmonic suppression and implementation simplicity. However, its real world application is limited because the non-ideal supply voltage for APFs can influence its performance so that the source currents are still distorted after compensation. This paper proposes a modified one cycle control (MOCC) scheme to improve the performance of three-phase shunt APFs under non-ideal supply voltage conditions. In this paper a detailed mathematical derivation has been presented and the key control law of the MOCC has been developed for adaption to the non-ideal supply voltages, following the control philosophy of simplicity. A relatively simple sequence filter is introduced to extract the harmonic components of supply voltages. The modified scheme can be easily implemented. The proposed control strategy has excellent performance and a 5kVA APF hardware platform has been implemented to validate the feasibility and performance of the proposed strategy.

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“…These methods also require separate harmonic resonance generator and current controller. Some other methods [3],[4] except [5], [6] cannot differentiate between the reactive component and harmonic components of the load current. Some methods [7] has the flexibility to supply the harmonic components of the load and/or reactive power of the load depending on the requirement of the application and having relatively simple control structure.…”

mentioning

confidence: 99%

A New Control Strategy for Harmonic Elimination Using shunt Active Filter

Suresh¹

2015

IJAREEIE

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Load compensators are used for reactive power compensation as well as harmonic compensation have the disadvantage of high cost and poor efficiency due to switching losses. So it is good to use active harmonic filters for harmonic compensation and traditional methods comprising of thyristor-switched capacitors for reactive power compensation. Existing load compensators have the capability to differentiate between the fundamental reactive component and harmonic components of the load currents ,but are complex and so they are not cost effective. In order to overcome this limitation, a shunt harmonic filter, which is capable of compensating only the harmonic components of the load current and having a simple control circuitary is proposed in this paper. I.INTRODUCTIONA shunt load compensator is used for harmonic current requirement of the nonlinear load can additionally provides reactive power support for power factor correction and/or voltage regulation As the load compensator supplies the reactive component of the load current along with harmonics, it is required to be rated to carry the reactive component of the load current also. Moreover, the high bandwidth requirement of the controller which forces the compensator to supply the harmonic component of the load current necessitates the semiconductor switches to operate at high switching frequencies Operation of semiconductor devices at high switching frequency while they carry large current leads to increment in device current rating and switching losses. The increased rating makes the load compensators expensive.The objective is to overcome this limitation is by providing compensators that act as active harmonic filters (AHFs) to compensate only for the harmonic components of the load current, while traditional methods comprising of thyristor switched capacitors/reactors are used to carry out reactive power compensation of the given load. So the converter of an AHF has to carry only the harmonic components of the load current, its current rating and the incurred power loss are less compared to that of a load compensator.In this paper, it proposes an efficient and simple control scheme for harmonic elimination using shunt active filter. It is capable of compensating only the harmonic components of the load current .So the losses can be minimized and also the cost. II.LITERATURE SURVEYThere are so many methods for harmonic elimination. Some of these methods [1],[2] require the information of the fundamental component of the grid voltage to extract the harmonics present in the source current. The grid voltage is likely to contain distortions, including multiple zero crossings, and the service of a phase-locked loop (PLL) is employed to extract the fundamental component of the grid voltage. These methods also require separate harmonic resonance generator and current controller. Some other methods [3],[4] except [5], [6] cannot differentiate between the reactive component and harmonic components of the load current. Some methods [7] has the flexibility to ...

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Unified constant-frequency integration control of active power filters-steady-state and dynamics

Cited by 151 publications

References 18 publications

A Load Compensator Based on One-Cycle Control with Plug-In Repetitive Control

A Load Compensator Based on One-Cycle Control with Plug-In Repetitive Control

An Improved One Cycle Control for Active Power Filters under Non-Ideal Voltage Conditions

A New Control Strategy for Harmonic Elimination Using shunt Active Filter

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